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This section describes the legacy buffer protocol, which has been introduced
in Python 1.6. It is still supported but deprecated in the Python 2.x series.
Python 3 introduces a new buffer protocol which fixes weaknesses and
shortcomings of the protocol, and has been backported to Python 2.6. See
Buffers and Memoryview Objects for more information.

Returns a pointer to a read-only memory location usable as character-based
input. The obj argument must support the single-segment character buffer
interface. On success, returns 0, sets buffer to the memory location
and buffer_len to the buffer length. Returns -1 and sets a
TypeError on error.

New in version 1.6.

Changed in version 2.5: This function used an int* type for buffer_len. This might
require changes in your code for properly supporting 64-bit systems.

Returns a pointer to a read-only memory location containing arbitrary data.
The obj argument must support the single-segment readable buffer
interface. On success, returns 0, sets buffer to the memory location
and buffer_len to the buffer length. Returns -1 and sets a
TypeError on error.

New in version 1.6.

Changed in version 2.5: This function used an int* type for buffer_len. This might
require changes in your code for properly supporting 64-bit systems.

Returns a pointer to a writeable memory location. The obj argument must
support the single-segment, character buffer interface. On success,
returns 0, sets buffer to the memory location and buffer_len to the
buffer length. Returns -1 and sets a TypeError on error.

New in version 1.6.

Changed in version 2.5: This function used an int* type for buffer_len. This might
require changes in your code for properly supporting 64-bit systems.